Number of length n arrays of permutations of 0..n-1 with each element moved by -3 to 3 places and with no two consecutive decreases.

A263678

Number of length n arrays of permutations of 0..n-1 with each element moved by -3 to 3 places and with no two consecutive decreases.

Terms

    a(0) =1a(1) =2a(2) =5a(3) =17a(4) =53a(5) =155a(6) =429a(7) =1210a(8) =3457a(9) =9948a(10) =28528a(11) =81636a(12) =233344a(13) =667390a(14) =1909626a(15) =5464861a(16) =15637212a(17) =44741387a(18) =128011961a(19) =366269502a(20) =1047988385a(21) =2998562936a(22) =8579622673a(23) =24548350663a(24) =70238679485a(25) =200969734254a(26) =575022887468

External references